Re: [LAU] Looking for Audio Watermarking Advice & Tools

On Sunday 23 October 2011, Kevin Cosgrove wrote:
>
> On 23 October 2011 at 17:38, Fons Adriaensen <fons@email-addr-hidden> wrote:
>
> > On Sun, Oct 23, 2011 at 08:13:24AM -0700, Kevin Cosgrove wrote:
> >
> > > The subject line says it all. I'm looking for a Linux solution to
> > > watermarking audio. Thanks...
> >
> > I've never seen any. The amount of work to develop such a thing
> > would depend on your exact requirements. Important parameters
> > are:
>
> I never thought much about requirements, as I wasn't thinking of
> creating one.
>
> > * Which operations should leave the watermark intact. If this
> > includes lossy encoding/decoding things get more difficult.
>
> Maybe version 0.5 would work with lossless and version 2.X would
> work with lossy?
>
> > * The minium duration of a fragment that allows the mark to be
> > detected.
>
> However long is easiest I suppose. 1 sec? 10 sec? Repeated in
> spots through the file X times, where 1 < X < (length in minutes)?
>
> > * How strong the 'provability' should be.
>
> Maybe version 0.5 is 10% chance of proving, and version 2.X would be
> better?
>
> > * Operational requirements. For example, should it be possible
> > to verify the mark without having the information necessary
> > to remove it ?
>
> Some operations would be:
>
> - Mark
> - Un-mark
> - Re-mark
> - Remove
> - Verify signature
> - Verify content
>
> In a later version maybe the tool could be able to use some of the
> above tools, in cooperation with other sound file tools, to preserve
> a watermark across sound file format conversions, between lossless
> forms and crossing between lossy/lossless domains.
>
> For version 0.01 even just being able to attach an md5 sum of an
> audio file along with a gpg signature would be cool.
>
> I use a subset of GNUPG's capability. Maybe you can see that in
> my above requirements? ;-)
>
> Is that a useful start on a start?

This reminds me when the SDMI (Secure Digital Music Initiative) [1] tried to
use audio watermarks among other technologies trying to stop piracy. AFAIK,
the initiative was not a success [2].

Regards,
Pedro

[1]
http://en.wikipedia.org/wiki/Secure_Digital_Music_Initiative
[2]
http://cryptome.org/sdmi-attack.htm
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Received on Mon Oct 24 08:15:06 2011